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Process Equipment and Plant Design

Process Equipment and Plant Design
With increase in the number of shell passes, the value of FT

Remains same, only if the number of tube passes does not change
Decreases
Increases
Remains same

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Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Less than arithmetic mean value
More than geometric mean value
More than arithmetic mean value
Both B & C

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

(D₂² - D₁²)/D₂²
None of these
(D₂² - D₁²)/D₁²
D₂ - D₁

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

5 and 10
45 and 75
300 and 500
180 and 300

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Process Equipment and Plant Design
Accidents in chemical plants are mostly due to

Inadequate equipment design
Improper layout of the equipments
Failure of equipments
Faulty operating procedures

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Process Equipment and Plant Design
With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will

Decrease
Increase or decrease depending on the nature of the dust
Increase
Remain unaffected

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